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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dce367304106910babeb82e5937748ac87e3d83a409bfe9d3afa1b81d7440fd' 
  AND token = 'r9l12Sp8w5m/aqtnSED7+n1MewzjqhkpL/2XtAuUaS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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