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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d83d06fb18bfd6c29f266f749efe1ba079b1f515898c479f5a264bf912738cb' 
  AND token = 'CEeFXTb/bevpoxdW1Ktwne4gVcZ4ythXUNlIcQggeHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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