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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ef989f2f23342593f0b1c13ecbd96f32e1f95f3681deaf8f57cecc11b089b4' 
  AND token = 'E5g53ANhowG4syjsdmewXgeiBGim/zHvP5leJ14rtNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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