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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4e8a9599538118b336c99d1c52f914fed232987081d66710b6dadf2d498ff7' 
  AND token = 'PQX+bwB8WgPQNM/3Ro+dWTid4Tfp4esrqZFIyXU5WKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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