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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48473c30d077adf8b97894d63e608157e6e2db1d054563db8f02ff2841d4bce5' 
  AND token = 'wSzWCT83bW7/V0UpX3N4TDoVxht5Ah53go9wQVZfDC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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