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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe07351d3b2c5ecaa33f0ca9fac334a9dbef9e2da5640198c80d3e1f7e1e1c1' 
  AND token = '197ngld+1ypFsv9+I0wcIIh1pGs061Aogx+0I+DOa1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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