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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb52e4a98cfb0323372d9810adab7595d1c5d34852c29b495c9b7393aa8efc0a' 
  AND token = 'a3eJaCtn4EfLNSIE0b4VPGieMDNOp4U9NCL6a7DDRhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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