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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d20f0746160379275c15bbab2a3bfed3561813bb84920aaaaf1e4e1ab93e3b3' 
  AND token = 'ND09RO14Nj4WR37KVPYuRm3DB4AXSe8bOR+1TJTaO+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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