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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf4044ece8705131ce692e8a3e27570dbdb532479a5f7f4650a06ce2cee74c7' 
  AND token = '+G0b9t5x1JMnB/Tu+qhIGF6/ddnmNnBAHqW3R7znh+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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