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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01bdd3caab328d4ade88ef61fc122fc6365960b73e88e377d958212bae34eba' 
  AND token = 'mtmu4S1vpoiLoqEP2DXhPwhkdsqiaKpbZk2pDBa1LlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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