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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5c0316d20c2b6143aaaf0e6fa35e2de6df82b33aa7d172b39ac9723902b38e' 
  AND token = 'Vd7M8aegnozDF75rNm2AgyFBcADmySqsLMgAuPvvSGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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