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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b17611d5f248698c3088ed1277155d605190bab1364b21b977bc072181cd6e' 
  AND token = 'G4HcPzcdLpfCY0ACdHoj0geAp7k9rvrjCW6NJGG4Sf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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