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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e572b84135603945f9d4c1ae0d832db557617edfc1e97a6bdb16776ea374e4' 
  AND token = 'l5i5ElF2xnDOcVvGGuzz8KZNU112JERS7cP+g2htlRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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