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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6dd22f5cd1a1a2bd1572417157e93a885911fbcfa095a496cbaac380c1788a7' 
  AND token = '3Canx2jvKDdlhxjw+1DUbpjwaqdbpX24ArIybtqd9Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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