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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda7a074dde625be5c64b58cabab62063494fd5f88f9a7c97618543bace48b24' 
  AND token = 'hYN3mTmctdwHMZ88S6lktkH/8040f2yguzdyxpBNvNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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