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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11b57daf4ff233ea04e5a1e307141a2ac48e081a572638c8eed4aa7f2e99187' 
  AND token = 'j59r3vM1ClrrPi3iVOSpIZfBoI2BxX1/H0r7KT6s8zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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