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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df75bee8b8c6253b467e6e1551dff0e519257de619e04d88658aeb20c4e39b3e' 
  AND token = 'rMIfHaFHmmI1cZGO19T7/og9fUWGK79R4IivVO/3+Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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