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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f653eec183eaffdea01d7ff7fb4e8d114e7097c296aa75b8f0f8f9f56e9961c' 
  AND token = 'rpWOqUECD09gKslr4mqdRDqBD6fDQywKsfTCcm0tnLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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