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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87077a7b45243ba907c3f6beb85102d6f2a20a6ae5606ab739aba3b8137678df' 
  AND token = 'COT1RY0GTG4SZlurWAHKKwiiuIAj4ITdaJuuzPlL2PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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