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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b68e7d56c76cff9ab11022a7c6a34ce63180a8f358fd5a0e0afe7643fe64020' 
  AND token = 'P+k9L3ZwEan9vO0GwVq2sUwbPgSPksCoKEs/f5s6J2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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