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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a15817353b3507c9ea00edba37cb67b6be29277dba12a78afb57e682fd1c25b' 
  AND token = 'DiXrDyxBACAY28nOmH2Htd1I5PqmT10dESPNrt/PLvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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