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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7f494a41568ddedde7e5261d0b637af1cca90249523bc05076987a3d380584' 
  AND token = 'KW/Zs3yOYpJNo3Q7CCRFAu3XDveVjcs3+/j44kDo3C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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