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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a150b0cbd67146b8d10bd8c6ec1bbb76c3695dd781010736dc740c7323f4b0' 
  AND token = 'Uy8QXpA0Omq9kwjzY7ASzaaKScn/Z2J3xaQ4p5w/cHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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