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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52895f9d1d99dcc3f3869eabc3fdf516accf4f97afc7b8c616f35a3107e14c10' 
  AND token = 'f3too3onjCfTyAb1vy7JbW1gsWGI4Dshr6oOipF7coA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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