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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58864ce479fc1e43504f2a509d8afd2839b481626645a18673a3d1ccc68b669e' 
  AND token = 'WD+CdPgCKpHJmUNfFfnOynQbR2VyfaWh7501u+6uMFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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