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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36de6f363d01bb75da3c03eaa06bee739e8c95e6c282a44b91591b003b0e14d7' 
  AND token = 'xo7fc2uYoXeU0zfjFR2x7leyXCkJXqSw+JMlikU2iQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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