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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcae49871e48878731fcc1e271c7eb5a812261e4ad1ffca28714d995b2eb0ddb' 
  AND token = 'TdU0fNdUpCGGpP7pnNoKWgJkxAx0elo3y7y4qSlxZ8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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