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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579244a52be5b45e80ce5a57fba506daa0597abc734e360687db3f8264a0ab86' 
  AND token = 'sq2t/OUVDl91uCzGs3BfOR944ES261u3CJrY+WzZzwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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