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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03997310b2b1b1d816f136eb9a8418fa8ad7637320e5e345f320bb0febcfdc45' 
  AND token = '3KbY5pNXkGoYlnz4SHy3l3ANo7KdvdCPfu6HNFo1XRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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