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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bdcd89659ee5c315fe3886f70041bcd98304b4af000cd71adba6693cd5ffe6' 
  AND token = '3t+R8oSMZ85tkfFXYuCIjj7YR83xy7SnCJWzCDfkIv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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