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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e2a94a6d5980b383d23200783a6c87ce830c7d7cc2a246d6ef314e5b96dbb3' 
  AND token = 'abrBOaUHQDeQcREy64mkQgzjrM77Uz2Mu5Z3t891RRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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