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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5684f89a53db33c77c08f2d7e39a2932e1653ac94a1a7d6e9ec451963e14aef' 
  AND token = 'lfn0+zY2K6jdijzMaXA7cuROJ5/gN7igw5H4yb/UjSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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