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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26970ddaacf15a24e47b0d952bb952be798984dba16c9daa3a0efc7d77dc92b1' 
  AND token = 'Lahrd/qy1qj0En3UcgmLijyZcCI6AH/dk7CrltioKv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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