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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9aa606df891a83c193676d14f8146a6717b8440f9517ee63ddfd4d595e6a28' 
  AND token = 'm7+EtaTVetL278+r8Ac5gjkwmx0awjxkdDYyX9294vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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