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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103c37b61e1e759712bb841c09e499202c9dd999de8a1db6563326b0ec6542ee' 
  AND token = 'HnT5gzX49FuOuLYp0/a7iaDqFUG6AZ/9YvoroC3wcTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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