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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b9575e69e19db3ddcf78fa0c07f9b9535b9d52044924ad31a1971b361cbb19' 
  AND token = '+X74SHfOYyJWAMHcHWxG4EZKCdpx8s3Q+Uk+6QApQnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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