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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5e237d972dd9a1531f11a7bdd8a6c686b3358371af2eb310eb67dc5cd49d6e' 
  AND token = '6LHtB7eFGZU9APgNILdEdX9kd1e/lnnsMlmPtnwJWwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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