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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7f1b828d6f7c2a33c4ac090ae420bead73e373c12b7ee11349388ac5924140' 
  AND token = 'YMexTM7B+jtjcHGyfURWjk6dIoXL+c5ckSt/yPuJWMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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