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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455e55094d8c41b58926fa7245bfc1098a0d75fa2dd5641f59bd21bdbdb59219' 
  AND token = 'cvQCO2KSgxVvLrhP9F3R1WDS2keiYCFG+QsYU7YSdkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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