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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f78eba02d1ef8073b9f08d48996b4a226935df75b6e3da121a3cbbc26e95d6' 
  AND token = 'Eq/PJ8zFEvU1jReiiSsDotT8f3+IDDeu+1Ka5AToV5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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