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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861a777895dbc7cdf13ad960c614354242a28b6270fdaec62261c5dae729ab1b' 
  AND token = 'VI1+xyGK2UyS8AUCMyaxjgI9I9TUc9uVQVUoINX4fgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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