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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb6e0af7dac9ca5ac089e16cf27b580cdd6a9d7e8c7b0ae02ee6b33c8c45537' 
  AND token = 'Gczq7PyUAW4idzHcFAny+D329Q4QFGFJIn049M+mSRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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