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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71603d4f0ad5fc3966bfcd5ddfc10115757b32d53036e0979adfd91e40f2e3a' 
  AND token = '1SQfW/krTL70V46pAhC+YPcQGxVWJf2uG4x/hFHIFhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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