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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec9807e071c9e0fd84f76cda22470d7a5bafb2aef523ff448aa221bacaaa2ce' 
  AND token = 'JmbRUCapxLdNXGsV2bOOdsuGn3hop6lm/KZMwh6O+s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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