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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0b14b03eeadd6c8b46b0908c156a1d5de6f7624c5c7d1c0d9a49c6ae02ec18' 
  AND token = 'eMKLWJDtBUuFUyry7x6fsumU0awoMXxGo+AOq5GXcXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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