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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b737b7a0fd32092cd7892a19a9f2c366e7feeb2f975972d836b3fb21fc877270' 
  AND token = 'HfU0PnojnByVifNO77NZ5QLi+xEfe4/AZDQckAtMeKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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