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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3e43adaaca639260052eb049065a0567b907837abaf87b66930c6f53536ad8' 
  AND token = 'gN10cshGwAhxo255h8pS0fUcbpEE+kN0S/A2B+m2FNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}