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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371023a7cbbef4a7bef67184edb593159974f9b0bc1bc72056b39d30734f30dd' 
  AND token = 'V7XX50qBW55UqQUDd60eUk2t1omDrq9A+L49obRyLXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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