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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67a95ccbdd60f0b6539435375b8655f2419bdc937e62c8086e64cdfb7d13a9c' 
  AND token = '7eqmOqDPeUukOgoDCSZqiol3g87RE/M/qmtn7OBC/PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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