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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f511336e04a09fd31d49e24aab8ea7512865f58c586ce2b31ae737f8f557ee5b' 
  AND token = 'H4XZjhXiX8UpXV3vxjLhB5VrpRF38jY4Veuy0TCoS/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00144

JSON explain

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