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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7edb6691cea926ee1531343a99bb5730b015f01f78fbc32171939418c83cff' 
  AND token = 'IrKV80KlcXGPlDc6+wCUeRMfyehzPE1QnewXE+qG/Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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