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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de1aadd5e060fde8595a13ed6786d6d159df8de0b77861b6c8a3888700fc2ea' 
  AND token = '8plz78uS+ZQ1Mkx/uiYzwQH4g3Ji970EilPidx0fq8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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